Optical member driving mechanism

ABSTRACT

An optical member driving mechanism is provided. The optical member driving mechanism includes a movable portion, a fixed portion, a driving assembly and a guiding assembly. The movable portion is connected to an optical member, and is movable relative to the fixed portion. The driving assembly drives the movable portion to move relative to the fixed portion. The guiding assembly limits the mode of movement for the movable portion relative to the fixed portion.

CROSS REFERENCE TO RELATED APPLICATIONS

This application claims the benefit of U.S. Provisional Application No. 62/887,905, filed Aug. 16, 2019, and claims priority of European Patent Application No. 19218896.9, filed Dec. 20, 2019, the entirety of which are incorporated by reference herein.

BACKGROUND Technical Field

The disclosure relates to an optical member driving mechanism, and in particular to an optical member driving mechanism including a guiding assembly that is configured to limit the mode of movement for the movable portion relative to the fixed portion.

Description of the Related Art

With the development of technology, many electronic devices (such as smartphones and digital cameras) nowadays perform the functions of a camera or video recorder. The use of such electronic devices has become increasingly widespread, and these electronic devices have been designed for convenience and miniaturization to provide users with more choice.

Electronic devices with a camera or video function usually have a driving module disposed therein to drive an optical member to move along an optical axis. Therefore, an autofocus (AF) and/or optical image stabilization (OIS) function is achieved. Light may pass through the optical member and form an image on a photosensitive member.

However, the arrangement of the driving module may occupy a certain amount of space, limiting the design of the electronic device. Accordingly, the size of the electronic device is usually not sufficient to meet users' requirements. Therefore, how to solve the aforementioned problem has become an important topic.

BRIEF SUMMARY

The present disclosure provides an optical member driving mechanism. The optical member driving mechanism includes a movable portion, a fixed portion, a driving assembly and a guiding assembly. The movable portion is connected to an optical member, and is movable relative to the fixed portion. The driving assembly drives the movable portion to move relative to the fixed portion. The guiding assembly limits the mode of movement for the movable portion relative to the fixed portion.

In an embodiment, the guiding assembly includes a first track that is disposed on the fixed portion, and the material of the first track includes metal. In an embodiment, the guiding assembly includes a second track that is disposed on the movable portion and corresponding to the first track, and the material of the second track includes metal. In an embodiment, the optical member driving mechanism further includes a lubricant that is disposed on the first track and/or the second track.

In an embodiment, the optical member driving mechanism further includes a magnetic permeable structure that is embedded in the fixed portion, wherein the magnetic permeable structure and the first track are disposed at different heights. In an embodiment, the optical member driving mechanism further includes a circuit component that is embedded in the fixed portion, wherein the circuit component, the magnetic permeable structure and the first track are disposed at different heights.

In an embodiment, the optical member driving mechanism further includes a circuit component that is disposed on the fixed portion, wherein when viewed in a direction that is perpendicular to the direction of motion of the movable portion, the circuit component and the first track do not overlap. In an embodiment, the first track has a curved portion extending in a direction that is not parallel to the extending direction of the first track.

In an embodiment, the optical member driving mechanism further includes a metallic member that is embedded in the movable portion, wherein the metallic member and the second track are disposed at different heights. In an embodiment, the metallic member further includes an extending portion that extends in a direction that is not parallel to the direction of motion of the movable portion. In an embodiment, the movable portion has a reflection surface, and the reflection surface is not parallel to the direction of motion of the movable portion.

In an embodiment, the optical member driving mechanism further includes a damping material that is disposed between the movable portion and the fixed portion, wherein the movable portion further includes a stopping structure extending towards the fixed portion, and the damping material is adjacent to the stopping structure. In an embodiment, the movable portion has a containing space for containing the damping material. In an embodiment, the shortest distance between the damping material and the fixed portion is not longer than the shortest distance between the stopping structure and the fixed portion.

In an embodiment, the fixed portion includes a base that is located below the movable portion, the base has a plurality of holes, and the sizes of the holes are not exactly the same. In an embodiment, the base has a top surface and a bottom surface, the top surface is disposed towards the movable portion, the bottom surface is opposite to the top surface, one of the holes is located on the top surface, another of the holes is located on the bottom surface, and the hole located on the top surface does not communicate with the hole located on the bottom surface.

In an embodiment, the guiding assembly includes a first recess and at least one second recess, the length of the first recess is longer than the length of the second recess, and the first recess and the second recess are located on different sides. In an embodiment, either the first recess or the second recess is disposed on three sides of the fixed portion. In an embodiment, the guiding assembly further includes a plurality of rolling members disposed in the first recess. In an embodiment, the rolling members include a first rolling member and a second rolling member that is adjacent to the first rolling member, and the size of the first rolling member is different from the size of the second rolling member.

BRIEF DESCRIPTION OF THE DRAWINGS

The disclosure can be more fully understood by reading the subsequent detailed description and examples with references made to the accompanying drawings, wherein:

FIG. 1 is a perspective view illustrating an optical member driving mechanism in accordance with an embodiment of the present disclosure.

FIG. 2 is an exploded view illustrating the optical member driving mechanism shown in FIG. 1.

FIG. 3 is a cross-sectional view illustrating along line 22-B shown in FIG. 1.

FIG. 4 is a perspective view illustrating a base and a guiding assembly in accordance with an embodiment of the present disclosure.

FIG. 5 is a perspective view illustrating the base and a circuit component in accordance with an embodiment of the present disclosure.

FIG. 6 is a perspective view illustrating a movable portion in accordance with an embodiment of the present disclosure.

FIG. 7 is a perspective view illustrating the interior structure of the optical member driving mechanism in accordance with an embodiment of the present disclosure.

FIG. 8A is a top view illustrating the base in accordance with an embodiment of the present disclosure.

FIG. 8B is a bottom view illustrating the base in accordance with an embodiment of the present disclosure.

DETAILED DESCRIPTION OF THE INVENTION

The optical member driving mechanisms of some embodiments of the present disclosure are described in the following description. However, it should be appreciated that the following detailed description of some embodiments of the disclosure provides various concepts of the present disclosure which may be performed in specific backgrounds that can vary widely. The specific embodiments disclosed are provided merely to clearly describe the usage of the present disclosure by some specific methods without limiting the scope of the present disclosure.

In addition, relative terms such as “lower” or “bottom,” “upper” or “top” may be used in the following embodiments in order to describe the relationship between one element and another element in the figures. It should be appreciated that if the device shown in the figures is flipped upside-down, the element located on the “lower” side may become the element located on the “upper” side.

It should be understood that although the terms “first,” “second,” etc. may be used herein to describe various elements, materials and/or portions, these elements, materials and/or portions are not limited by the above terms. These terms merely serve to distinguish different elements, materials and/or portions. Therefore, a first element, material and/or portion may be referred to as a second element, material and/or portion without departing from the teaching of some embodiments in the present disclosure.

Unless defined otherwise, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. It should be appreciated that, in each case, the term, which is defined in a commonly used dictionary, should be interpreted as having a meaning that conforms to the relative skills of the present disclosure and the background or the context of the present disclosure, and should not be interpreted in an idealized or overly formal manner unless so defined in the present disclosure. In addition, the terms “substantially,” “approximately” or “about” may also be recited in the present disclosure, and these terms are intended to encompass situations or ranges that is substantially or exactly the same as the description herein. It should be noted that unless defined specifically, even if the above terms are not recited in the description, it should be read as the same meaning as those approximate terms are recited.

FIG. 1 is a schematic perspective view illustrating an optical member driving mechanism 22-101 in accordance with an embodiment of the present disclosure. It should be noted that, in this embodiment, the optical member driving mechanism 22-101 may be, for example, disposed in the electronic devices with camera function for driving an optical member (not shown), and can perform an autofocus (AF) and/or optical image stabilization (OIS) function.

As shown in FIG. 1, the optical member driving mechanism 22-101 has a main axis 22-C that is substantially parallel to the Z axis. The optical member driving mechanism 22-101 includes a housing 22-110 which has a top surface 22-111. The top surface 22-111 extends in a direction (i.e. the X-Y plane) that is parallel to the main axis 22-C. In addition, the optical member driving mechanism 22-101 includes a movable portion 22-130 that is movable relative to the housing 22-110. The movable portion 22-130 has a top surface 22-131, wherein the top surface 22-131 extends in a direction (i.e. the X-Y plane) that is parallel to the main axis 22-C. For example, the top surfaces 22-111 and 22-131 are located on the same horizontal plane, but the present disclosure is not limited thereto.

The movable portion 22-130 further has a reflection surface 22-132, wherein the reflection surface 22-132 is not parallel to the direction of motion of the movable portion 22-130. In the present embodiment, the reflection surface 22-132 is substantially perpendicular to the top surface 22-131, but the present disclosure is not limited thereto. In some other embodiments, the reflection surface 22-132 is not parallel to the top surface 22-131. In some embodiments, an optical element (not shown) may be disposed on the reflection surface 22-132, such that the light may be reflected after illuminating the above optical member. In other words, the optical member driving mechanism 22-101 may be configured to change the traveling direction of the light, and therefore perform an autofocus (AF) and/or optical image stabilization (OIS) function. In the present embodiment, when viewed in a direction (the Y axis) that is perpendicular to the reflection surface 22-132, the optical member may at least partially overlap the housing 22-110 or the movable portion 22-130. In addition, when viewed in a direction (e.g. the X axis, the Z axis) that is parallel to the reflection surface 22-132, the optical member does not overlap the housing 22-110 or the movable portion 22-130.

FIG. 2 is an exploded view illustrating the optical member driving mechanism 22-101 shown in FIG. 1. In the present embodiment, the optical member driving mechanism 22-101 has a substantial rectangular structure. The optical member driving mechanism 22-101 mainly includes a fixed portion 22-F, a movable portion 22-130, a driving assembly 22-140 and a guiding assembly 22-150. In the present embodiment, the fixed portion 22-F includes a housing 22-110 and a base 22-120.

The housing 22-110 is disposed on the base 22-120, and protect the elements disposed inside the optical member driving mechanism 22-101. In some embodiments, the housing 22-110 is made of metal or another material with sufficient hardness to provide good protection. The circuit component 22-170 is embedded in the base 22-120 for transmitting electric signals, such that the optical member driving mechanism 22-101 may control the position of the optical member disposed on the movable portion 22-130 according to the aforementioned electric signals. In the present embodiment, the circuit component 22-170 is disposed in the base 22-120 by insert molding, and thereby the required space for the optical member driving mechanism 22-101 may be reduced.

The movable portion 22-130 is movable relative to the fixed portion 22-F and is configured to carry an optical member. As shown in FIG. 2, the movable portion 22-130 is movably connected to the housing 22-110 and the base 22-120. The driving assembly 22-140 includes a magnetic member 22-141 and a coil 22-142. The magnetic member 22-141 is disposed on the movable portion 22-130, and the corresponding coil 22-142 is disposed on the base 22-120. When current is applied to the coil 22-142, an electromagnetic driving force may be generated by the coil 22-142 and the magnetic member 22-141 (i.e. the driving assembly 22-140) to drive the movable portion 22-130 and the optical member carried thereon to move along a horizontal direction (the Y axis) relative to the base 22-120, and therefore performing the autofocus (AF) and/or optical image stabilization (OIS) function. Furthermore, a magnetic permeable plate 22-P is disposed on the magnetic member 22-141 for concentrating the magnetic field of the magnetic member 22-141 so that the efficiency of the driving assembly 22-140 may be improved. For example, the magnetic permeable plate 22-P may be made of metal or another material with sufficient magnetic permeability.

In the present embodiment, an integrated circuit component 22-180 is disposed on the base 22-120. For example, the integrated circuit component 22-180 may detect the change of the magnetic field of the magnetic member 22-141, and the position of the movable portion 22-130 (and the optical member carried thereon) may be determined by the integrated circuit component 22-180. In some embodiments, the integrated circuit component 22-180 or the magnetic member 22-141 is disposed on the fixed portion 22-F, and the other of the integrated circuit component 22-180 or the magnetic member 22-141 is disposed on the movable portion 22-130.

In the present embodiment, the guiding assembly 22-150 includes a first track 22-151, a first rolling member 22-161 and a second rolling member 22-162. The first track 22-151 is disposed on and exposed from the base 22-120. In some embodiments, the first track 22-151 is disposed in the base 22-120 by insert molding. The first track 22-151 may include metallic material, and thereby the durability of the first track 22-151 may be enhanced. The size of the first rolling member 22-161 is different from the size of the second rolling member 22-162, and the first rolling member 22-161 and the second rolling member 22-162 are disposed on the first track 22-151 correspondingly. By means of the arrangement of the guiding assembly 22-150, the movable portion 22-130 is supported on the base 22-120, and the mode of movement for the movable portion 22-130 relative to the fixed portion 22-F may be limited. In the present embodiment, the movable portion 22-130 moves along the first track 22-151 in a horizontal direction (the Y axis).

FIG. 3 is a cross-sectional view illustrating along line B-B shown in FIG. 1. As shown in FIG. 3, the guiding assembly 22-150 further includes a second track 22-152 that is disposed on the movable portion 22-130 and corresponds to the first track 22-151. In other words, when viewed in a direction that is parallel to the main axis 22-C, the first track 22-151 and the second track 22-152 at least partially overlap. Similarly, the second track 22-152 may include metallic material, and thereby the durability of the second track 22-152 may be enhanced. In some embodiments, the first track 22-151 and the second track 22-152 completely overlap. The first rolling member 22-161 is disposed between the first track 22-151 and the second track 22-152, and abuts the first track 22-151 and the second track 22-152 at the same time. In some embodiments, a lubricant (not shown) is disposed on the first track 22-151 and/or the second track 22-152. As a result, the lubricant may be located between the first rolling member 22-161 and the first track 22-151, the second track 22-152, making the movement of the first rolling member 22-161 smoother. In some embodiments, the first track 22-151 may be parallel to the second track 22-152.

FIG. 4 is a perspective view illustrating the base 22-120 and the guiding assembly 22-150 in accordance with an embodiment of the present disclosure. As shown in FIG. 4, the base 22-120 further includes a magnetic permeable structure 22-123 that is embedded in the base 22-120. A magnetic attraction force may be generated by the magnetic permeable structure 22-123 and the magnetic member 22-141, and therefore helping to arrange the movable portion 22-130 on the base 22-120. In addition, the magnetic permeable structure 22-123, the circuit component 22-170 and the first track 22-151 are located at different heights in the base 22-120, respectively. It should be appreciated that the “height” discussed in the present disclosure means different positions in the Z axis. In the present embodiment, the circuit component 22-170 is located between the magnetic permeable structure 22-123 and the first track 22-151, but the present disclosure is not limited thereto.

The first track 22-151 has at least one bending portion 22-153 that extends in a direction that is not parallel to the extending direction (the Y axis) of the first track 22-151. The bending portion 22-153 may extend towards the interior of the base 22-120, and therefore helping to stably arrange the first track 22-151 on the base 22-120. The first track 22-151 further includes a first recess 22-156 and second recesses 22-157, wherein either the first recess 22-156 or the second recesses 22-157 are disposed on three sides of the base 22-120. In the present embodiment, the first recess 22-156 and the second recesses 22-157 are disposed on different sides of the base 22-120, and the first recess 22-156 is located between two second recesses 22-157. The length of the first recess 22-156 in the Y axis is longer than the length of the second recesses 22-157 in the Y axis. In some embodiments, the cross-section of the first recess 22-156 is V-shaped, and the cross-section of the second recesses 22-157 is U-shaped. By means of the above design, the difficult for arranging the first rolling member 22-161 and/or the second rolling member 22-162 may be reduced, and the tolerance may be dealt with in time.

In the present embodiment, the first rolling members 22-161 and the second rolling member 22-162 are disposed in the first recess 22-156. The second rolling member 22-162 is adjacent to the first rolling members 22-161 (such as located between two first rolling members 22-161). The arrangement of the first rolling members 22-161 and the second rolling member 22-162 may have a positive effect to the rolling of the first rolling members 22-161 and the second rolling member 22-162. In addition, single first rolling member 22-161 is disposed in the second recess 22-157.

FIG. 5 is a perspective view illustrating the base 22-120 and the circuit component 22-171 in accordance with an embodiment of the present disclosure. As shown in FIG. 5, the circuit component 22-171 is disposed on the base 22-120. For example, circuit component 22-171 may be a printed circuit board (PCB), a flexible printed circuit board (FPC) or any other suitable circuit component. The circuit component 22-171 may be electrically connected to the integrated circuit component 22-180, and therefore transmitting electric signals. In addition, an electric component 22-181 is disposed on the circuit component 22-171. For example, the electric component 22-181 may be a capacitor, a resistor, an inductor or any other suitable electric component. In the present embodiment, when viewed in a direction (the Z axis) that is perpendicular to the direction of motion of the movable portion 22-130, the circuit component 22-171 and the first track 22-151 do not overlap.

FIG. 6 is a perspective view illustrating the movable portion 22-130 in accordance with an embodiment of the present disclosure. As shown in FIG. 6, a metallic member 22-133 is embedded in the movable portion 22-130, wherein the metallic member 22-133 and the second track 22-152 are disposed at different heights. In some embodiments, the metallic member 22-133 has a material with a certain magnetic permeability, such that a magnetic attraction force may be generated by the metallic member 22-133 and the magnetic member 22-141, and therefore helping to arrange the magnetic member 22-141 at a correct position. The metallic member 22-133 further includes an extending portion 22-134, which extends along a direction (the Z axis) that is not parallel to the direction of motion of the movable portion 22-130. By means of the arrangement of the extending portion 22-134, the structural strength of the movable portion 22-130 may be enhanced.

FIG. 7 is a perspective view illustrating the interior structure of the optical member driving mechanism 22-101 in accordance with an embodiment of the present disclosure. It should be appreciated that in order to clearly show the interior structure of the optical member driving mechanism 22-101, the housing 22-110 is not illustrated in the present embodiment. As shown in FIG. 7, the movable portion 22-130 further includes a stopping structure 22-135 that extends towards the housing 22-110. By means of the arrangement of the stopping structure 22-135, the position of the movable portion 22-130 may be located. In addition, the movable portion 22-130 has containing spaces 22-136 that are adjacent to the stopping structure 22-135. In the present embodiment, the stopping structure 22-135 is located between two containing spaces 22-136. A damping material (not shown) may be disposed in the containing spaces 22-136, and therefore the damping material is located between the movable portion 22-130 and the housing 22-110. In some embodiments, the shortest distance between the damping material and the housing 22-110 is not longer than the shortest distance between the stopping structure 22-135 and the housing 22-110. The arrangement of the damping material may help to reduce the impact between the movable portion 22-130 and the housing 22-110. For example, the damping material may include gel or any other material with certain flexibility.

FIG. 8A is a top view illustrating the base 22-120 in accordance with an embodiment of the present disclosure. As shown in FIG. 8A, the base 22-120 has a top surface 22-121 that faces the movable portion 22-130. A plurality of holes 22-124A, 22-124B are formed on the top surface 22-121, wherein the size of the holes 22-124A is different from the size of the holes 22-124B. The arrangement of the holes 22-124A and 22-124B may help for the thermal-dissipation of the optical member driving mechanism 22-101.

FIG. 8B is a bottom view illustrating the base 22-120 in accordance with an embodiment of the present disclosure. As shown in FIG. 8B, the base 22-120 has a bottom surface 22-122 that is opposite to the top surface 22-121. A plurality of holes 22-124C, 22-124D are formed on the bottom surface 22-122, wherein the size of the holes 22-124C is different from the size of the holes 22-124D. Similarly, the arrangement of the holes 22-124C and 22-124D may also help for the thermal-dissipation of the optical member driving mechanism 22-101. In addition, in some embodiments, the holes 22-124A, 22-124B located on the top surface 22-121 do not communicate with the holes 22-124C, 22-124D located on the bottom surface 22-122. In some embodiments, when viewed in the extending direction (the Z axis) of the above holes, holes 22-124A, 22-124B do not overlap holes 22-124C, 22-124D.

As set forth above, the embodiments of the present disclosure provide an optical member driving mechanism including a guiding assembly that is configured to limit the mode of movement for the movable portion relative to the fixed portion. Since the guiding assembly includes metallic material, and therefore the structural strength and durability of the guiding assembly may be enhanced.

While the embodiments and the advantages of the present disclosure have been described above, it should be understood that those skilled in the art may make various changes, substitutions, and alterations to the present disclosure without departing from the spirit and scope of the present disclosure. In addition, the scope of the present disclosure is not limited to the processes, machines, manufacture, composition, devices, methods and steps in the specific embodiments described in the specification. Those skilled in the art may understand existing or developing processes, machines, manufacture, compositions, devices, methods and steps from some embodiments of the present disclosure. As long as those may perform substantially the same function in the aforementioned embodiments and obtain substantially the same result, they may be used in accordance with some embodiments of the present disclosure. Therefore, the scope of the present disclosure includes the aforementioned processes, machines, manufacture, composition, devices, methods, and steps. Furthermore, each of the appended claims constructs an individual embodiment, and the scope of the present disclosure also includes every combination of the appended claims and embodiments. 

What is claimed is:
 1. An optical member driving mechanism, comprising: a movable portion for connecting an optical member; a fixed portion comprising a base, wherein the movable portion is movable relative to the fixed portion; a driving assembly disposed between the movable portion and the fixed portion for driving the movable portion to move relative to the fixed portion, wherein the driving assembly comprises a coil and a magnetic member; and a guiding assembly disposed between the movable portion and the fixed portion and configured to limit the mode of movement for the movable portion relative to the fixed portion, wherein the guiding assembly comprises: a plurality of first tracks disposed on the fixed portion; and a plurality of second tracks disposed on the movable portion and corresponding to the first tracks; and a sensing assembly configured to detect the movement of the movable portion relative to the fixed portion, wherein the base has a first recess configured to contain the coil and a second recess configured to contain the sensing assembly, and the second recess is located in the first recess, wherein when viewed in a direction that is parallel to a top surface of the sensing assembly, the top surface is disposed towards the movable portion, the coil and the first tracks at least partially overlap, and the sensing assembly and the first tracks do not overlap.
 2. The optical member driving mechanism as claimed in claim 1, wherein the material of the first tracks comprises metal.
 3. The optical member driving mechanism as claimed in claim 2, wherein the material of the second tracks comprises metal.
 4. The optical member driving mechanism as claimed in claim 3, further comprising a lubricant disposed on the first tracks and/or the second tracks.
 5. The optical member driving mechanism as claimed in claim 2, further comprising a magnetic permeable structure embedded in the fixed portion, wherein the magnetic permeable structure and the first tracks are disposed at different heights.
 6. The optical member driving mechanism as claimed in claim 5, further comprising a circuit component embedded in the fixed portion, wherein the circuit component, the magnetic permeable structure and the first tracks are disposed at different heights.
 7. The optical member driving mechanism as claimed in claim 2, further comprising a circuit component disposed on the fixed portion, wherein when viewed in a direction that is perpendicular to a direction of motion of the movable portion, the circuit component and the first tracks do not overlap.
 8. The optical member driving mechanism as claimed in claim 2, wherein the first tracks have a curved portion extending in a direction that is not parallel to an extending direction of the first tracks.
 9. The optical member driving mechanism as claimed in claim 1, further comprising a metallic member embedded in the movable portion, wherein the metallic member and the second tracks are disposed at different heights.
 10. The optical member driving mechanism as claimed in claim 9, wherein the metallic member further comprises an extending portion that extends in a direction that is not parallel to the direction of motion of the movable portion.
 11. The optical member driving mechanism as claimed in claim 1, wherein the movable portion has a reflection surface, and the reflection surface is not parallel to the direction of motion of the movable portion.
 12. The optical member driving mechanism as claimed in claim 1, further comprising a damping material disposed between the movable portion and the fixed portion, wherein the movable portion further comprises a stopping structure extending towards the fixed portion, and the damping material is adjacent to the stopping structure.
 13. The optical member driving mechanism as claimed in claim 12, wherein the movable portion has a containing space for containing the damping material.
 14. The optical member driving mechanism as claimed in claim 12, wherein the shortest distance between the damping material and the fixed portion is not longer than the shortest distance between the stopping structure and the fixed portion.
 15. The optical member driving mechanism as claimed in claim 1, wherein the base is located below the movable portion, the base has a plurality of holes, and the sizes of the holes are not exactly the same.
 16. The optical member driving mechanism as claimed in claim 15, wherein the base has a top surface and a bottom surface, the top surface of the base is disposed towards the movable portion, the bottom surface is opposite to the top surface of the base, one of the holes is located on the top surface of the base, another of the holes is located on the bottom surface, and the hole located on the top surface of the base does not communicate with the hole located on the bottom surface.
 17. The optical member driving mechanism as claimed in claim 1, wherein the guiding assembly comprises a first recess and at least one second recess, the length of the first recess of the guiding assembly is longer than the length of the second recess of the guiding assembly, and the first recess and the second recess of the guiding assembly are located on different sides.
 18. The optical member driving mechanism as claimed in claim 17, wherein the first recess or the second recess of the guiding assembly is disposed on three sides of the fixed portion.
 19. The optical member driving mechanism as claimed in claim 17, wherein the guiding assembly further comprises a plurality of rolling members disposed in the first recess of the guiding assembly.
 20. An optical member driving mechanism, comprising: a movable portion for connecting an optical member; a fixed portion comprising a base having a plastic material, wherein the movable portion is movable relative to the fixed portion; a driving assembly disposed between the movable portion and the fixed portion for driving the movable portion to move relative to the fixed portion, wherein the driving assembly comprises a coil and a magnetic member; a guiding assembly disposed between the movable portion and the fixed portion and configured to limit the mode of movement for the movable portion relative to the fixed portion, wherein the guiding assembly comprises: a plurality of first tracks disposed on the fixed portion; and a plurality of second tracks disposed on the movable portion and corresponding to the first tracks; a circuit component having a metal material and electrically connected to the driving assembly, wherein the circuit component is at least partially embedded and not exposed from the base; and a sensing assembly configured to detect the movement of the movable portion relative to the fixed portion, wherein the base has a first recess configured to contain the coil and a second recess configured to contain the sensing assembly, and the second recess is located in the first recess, wherein when viewed in a direction that is parallel to a top surface of the sensing assembly, the top surface is disposed towards the movable portion, the coil and the first tracks at least partially overlap, and the sensing assembly and the first tracks do not overlap. 